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Hi,
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Sounds like the Green CRT drive board is needing replacement. The Green CRT could also be bad but usually the set will shut down if its the CRT, so I would try the Green CRT drive you can get one from www.tvrepairworld.com

You do not have any bulbs in this set. You have 3 CRT's. You can not get them anymore. You would have to pull all 3 out and send them in to have them rebuilt. For the cost of that, I would purchase a new TV.

If the TV works fine during the 5 minutes its on then your power supply in the tv is heating up and shutting off. If you have some mechanical knowledge you can buy another power supply from Ebay for around 35.00 and replace it. will require some soldering

Hi,This kind of problem occurs due to failure of convergence output ICs in Sony KP-51HW40 tv.Replace convergence output ICs to solve tv problem.Local tv repairman will do this job if you have no experience of electronics stuff repair.Thanks.

this tv has three parts to screen , the most outer part is called CONTRAST screen part # 408195411 for the model you gave.This is available @ sony.com (parts&access) Please make sure this what you need and model is correct..Good luck